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Earth was not a fun place to be 66 million years ago. The end of Cretaceous period was a time of mass extinction: Approximately 75 percent of the planet’s plants and animals died off, an event arguably spurred by an unholy ripple effect ignited by an asteroid pummeling into the Yucatán Peninsula. Scientist increasingly agree that this impact accelerated catastrophic volcanic activity in India’s Deccan Traps, prompting massive eruptions for thousands of years, and ultimately ended the reign of the dinosaurs.
originally posted by: IgnorantGod
So, in my Forest wildlife class, my teacher briefly spoke about an article. It was revealing new hypothesis about the extinction of the giant lizards.
It references a first study published in the magazine Nature February 5th. Three british searchers of Reading university claim that the dinosaur spread so much fast, that the biodiversity of their environments were threatened. But the article says that this theory is debated amongst the numerous searchers.
The second study is more focusing on the asteroid that fell 66 millions ago. Published last January in the scientific magazine Sciences Advances, it explains that the impact spot of the asteroid was the worst possible.
originally posted by: RAY1990
a reply to: IgnorantGod
Know thy place?
The best we can ever do is theorise, we get snippets of time to look at. I'm not sure we'll ever truly know what wiped the dinosaurs out. Who's to say they ever were?
We all die, my body in 100,000 years time won't be evidence of human extinction. Now imagine muddying the waters because Homo Sapiens branched into 6 distinct species and another primate developed bipedal movement with opposable thumbs. Without DNA or enough fossils to establish some kind of genealogy we're only ever going to be theorising. We might just think they're all humans.
With dinosaurs it's a lot more theory than fact.
Which kind of brings me to adaption...
What is life?
I like to think it's just clever matter. DNA knows one fundamental thing, a thing the whole universe seemingly runs on. Convert energy into matter / convert matter into energy. We as life are like the catalysts of matter. To relate that to dinosaurs?
They had many pioneers in their ranks.
Think of it this way. Life needs energy and it seems when ever niches are filled they are filled quickly, with multiple lifeforms from various backgrounds developing to exploit the new wealth of energy.
This is why some species change, others don't.
Dinosaurs were extremely varied. Look for the pioneers, some of them left legacies. A theme I always notice with the extinct is "how?" or "why?" when ultimately I think the question should be "what?"
What causes the design of the extinct to become folly?
Evolution, not just life either.
originally posted by: bluechevytree
The thing that really killed the dinosaurs is they were cold blooded.
even with the meteor.and volcanos, and all that other stuff happening a lot of warm blooded species survived.
many small cold bloodied animals survived also, but being giants and cold blooded doomed the dinosaurs.
Top five current hypotheses
Dinosaurs were complete endotherms, just like birds, their descendants.
Some or all dinosaurs had some intermediate type of physiology between endothermy and ectothermy.
We know too little about dinosaurs to hazard a guess at what their physiology was like.
Dinosaurs were mostly inertial homeotherms; they were ectothermic but maintained a constant body temperature by growing large. Small dinosaurs were typical ectotherms, maybe with a slightly elevated metabolic rate.
All dinosaurs were simple ectotherms, enjoying the warm Mesozoic climate. But that's okay; many ectotherms are quite active, so dinosaurs could be active, too.
Recovering the Lost World,
A Saturnian Cosmology -- Jno Cook
Chapter 3: The Osiris Mystery.